National Physical Laboratory

Fibre Cladding Diameter

Optical fibre

Calibration of the cladding diameter of optical fibres. Fibres with diameters in the range 123 µm to 127 µm can be calibrated with a best measurement capability of ± 0.05 µm.

NPL uses a non-contact measurement method and can measure customer supplied fibres or can supply a calibrated reference fibre mounted in a retractable fibre holder which is used to protect the calibrated cleaved fibre end.

See an example Calibration Certificate

Typical measurement uncertainties

  • Cladding mean diameter: ± 0.05 µm
  • Non-circularity: ± 0.05%


Customer Service tel: +44 20 8943 8637

Last Updated: 23 May 2016
Created: 26 Jul 2007


Please note that the information will not be divulged to third parties, or used without your permission